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Dear Mr. Pesavento,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Subject-Numeric Files, 2/1/1963-1973 in the General Records of the Department of State (Record Group 59) that might contain documents you are seeking. In order to access records in this series, the Source Cards, 1910-1973 in Record Group 59 should be consulted as they serve as an index to this series. Please note that the 1950-1973 segment of the Source Cards are all national-security classified and are not available to researchers. For access to these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at firstname.lastname@example.org. RDT2 may perform very limited searches in the classified index for you.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
In addition, you may want to consult the FOREIGN RELATIONS OF THE UNITED STATES (FRUS). This is a Department of State publication of selected documents from the Department’s files and other sources. Besides providing the text of the most important documents on U.S. foreign policy, FRUS also provides a source citation (printed either as a header with the document or as a footnote). Those references to file numbers or other records identification are the keys to locating not only the printed documents but other documents on the same subject not selected for publication. Cited "Lot Files" may be difficult to identify among the records in the National Archives using just the Lot number. Volumes are available online at https://history.state.gov/historicaldocuments.
We hope this is helpful. Best of luck with your research!